drainage基本解释

n,[农工][建]排水；排水系统；污水；排水面积,同近

A handful of pebbles in the bottom of a flowerpot will help drainage..在花盆底下放一把鹅卵石能够帮助排水。

排水；下水道英释nnthe process or system by which water or waste liquid flows away

drainage system,排水系统，渠道系统；水系；引流装置.短语